How declare table variable in sql

Declare a table variable

DECLARE @t table

( 

    id        INT Identity, 

    column1   VARCHAR(200)

)

insert value to the table 

insert into @t(a)

     select 'aa'

     union

     select 'bb'

     union

     select 'cc'

     union

     select 'dd'

Run select query

select * from @t

1       aa

2       bb

3       cc

4       dd